Amphibious vehicle and oil lamp: what they have in common

1. Step 1. Amphibious vehicle — uses — Archimedes’ principle. It floats.
2. Step 2. Archimedes’ principle — is used in — Hot air balloon. Warm air is lighter than cold — Archimedes’ principle in the atmosphere.
3. Step 3. Hot air balloon — uses — Combustion. A fire heated the air inside.
4. Step 4. Combustion — is used in — Oil lamp. Burning oil gives the light.

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